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X500 Training Course

X500 Training Course. RF Trouble Shooting. RF & TX Part. RF & Transmitter Field. Rx. Receiver Flow Chart. U503. F501&F502. U501. Receiver Flow Chart. Rx : Set RF Measure Instrument: HP8960 or HP8922. 1. Operating mode  Test mode , Test function  TW 900/1800 Bend:

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X500 Training Course

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  1. X500 Training Course RF Trouble Shooting

  2. RF & TX Part RF & Transmitter Field

  3. Rx Receiver Flow Chart U503 F501&F502 U501

  4. Receiver Flow Chart Rx :Set RF Measure Instrument: HP8960 or HP8922 • 1. Operating mode  Test mode , Test function  TW • 900/1800 Bend: • Ch 62  947.4MHz , Cell power  -60dBm (Ch699: 1842.6MHz) • 3 850/1900 Band: • Ch 189  881.4MHz , Cell power  -60dBm (Ch661: 1.96GHz)

  5. GSM Receiver Placement

  6. Receiver Flow Chart Step 1. Check JP1 first, if we don’t insert RF cable, pin 1 must short to pin 2 Step 2. Use probe, touch C540 pin 1 : ~ -61dBm GSM Freq = 947.4MHz DCS Freq = 1842.6MHz S2 S1

  7. C540 pin 1, GSM Freq = 947.4MHz

  8. C540 pin 1, DCS Freq = 1842.6MHz

  9. Receiver Flow Chart Step 3. Use probe to touch C702 : ~ -61dBm (GSM Freq = 947.4MHz) Use probe to touch C555 : ~ -61dBm (DCS Freq = 1842.6MHz) S3 (EGSM) S3 (DCS)

  10. C702, GSM Freq = 947.4MHz

  11. C555, DCS Freq = 1842.6MHz

  12. Receiver Flow Chart Step 4. Use probe to touch L510 : ~ -63dBm (GSM Freq = 947.4MHz) Use probe to touch L513 : ~ -62dBm (DCS Freq = 1842.6MHz) S4 (EGSM) S4 (DCS)

  13. L510, GSM Freq = 947.4MHz

  14. L513, DCS Freq = 1842.6MHz

  15. Receiver Flow Chart Step 5. Check RX I and Q signal , Use probe to touch U501, Pin 55 to 58. S5

  16. U501, Pin 55 to 58, RX I and Q signal

  17. Transmitter Flow Chart U503 U502 S3, S4 U501 S2

  18. TX Transmitter Flow Chart TX :Set Transmitter Measure Instrument: HP8960 or HP8922 • 1. Operating mode  Test mode , Test function  TW • 900/1800 Bend: • Ch 62  902.4MHz, Cell power  -60dBm, MS_TX_level  5 • Ch 699  1747.6MHz, Cell power  -60dBm, MS_TX_level  0 • 3. 850/1900 Band: • Ch 189  881.4MHz, Cell power  -60dBm, MS_TX_level  5 • Ch 691  1.96GHz, Cell power  -60dBm, MS_TX_level  0

  19. GSM Transmitter Placement

  20. Transmitter Flow Chart Step 1.Check TX I and Q first.If TX I & Q, are not normal, this is mostly caused by G2, and in some minor cases by IOTA. S1

  21. TX I & Q signal

  22. Transmitter Flow Chart Step 2. Use Oscilloscope probe to touch R526 : ~ 1.5V (for GSM) Use Oscilloscope probe to touch R526 : ~ 1.7V (for DCS) S2

  23. R526 for GSM

  24. R526 for DCS

  25. Transmitter Flow Chart Step 3. Use probe to touch R538 : ~7 dBm, check PA_GSM_input (Freq = 902.4MHz) R540 : ~0 dBm, check PA_DCS_input (Freq = 1747.6MHz) If S2 and S3 are both ok, mean Transceiver is ok.) S3 (EGSM) S3 (DCS)

  26. R538 for GSM

  27. R540 for DCS

  28. Transmitter Flow Chart Step 4. Press TX_APC(350), use Oscilloscope probe to touch R546 : ~ 0.8V, Then, press TX_APC(550), and touch R546 : ~ 1.3V S4 Note: APC controls PA output power. If PA has not enough power or no power, we must check S3 and S4. When APC is increased,the voltage of S4 will be increased as well. It means S4 is normal.

  29. R546 for TX_APC(350)

  30. R546 for TX_APC(550)

  31. DCS Receiver Placement

  32. DCS Transmitter Placement

  33. Any Questions?

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